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IE(1) and IE(2) of Mg are 178 and 348 kc...

`IE_(1)` and `IE_(2)` of `Mg` are `178` and `348 kcal mol^(-1)`. The energy required for the reaction `Mg rarr Mg^(2+)+2e^(-)` is

A

`+170` kcal

B

`+526` kcal

C

`-170` kcal

D

`-526` kcal

Text Solution

Verified by Experts

The correct Answer is:
B
`E = IE_(1)+IE_(2) = 178 +348 =+ 526` kcal
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The second ionisation energies are higher than the first ionisation energies. This is mainly due to the fact that after the removal of the first electrons, the atom changes inot mono valent position ion. In the ion, the number of electrons decreases but the nuclear charge remains the same. As a result of this, the remaining electrons are held more tightly by the nucleus and it becomes difficult to remove the second electron . Therefore, the value of second ionisation energy . (IE_(2)) , is greater than that of the first ionisation energy (IE_(1)) . Similarly third ionisation energy (IE_(3)) is greater than that of second IE_(2) . IE_(1) and IE_(2) of Mg metal are 178 and 348 kcal/mol respectively . The energy required for the given reaction is : Mg(g)rarr Mg^(+2)(G)+2e^(-)

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GRB PUBLICATION-PERIODIC TABLE-C.Ionisation Energy
  1. The values of IE(I), IE(II), IE(III) and IE(IV) of an atom are respect...

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  2. IE(1) and IE(2) of Mg are 178 and 348 kcal mol^(-1). The energy requir...

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  3. Which represents alkali metals (ie., 1 group metals) based on (IE)(1) ...

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  4. Which is most similar for the elements in a group in the periodic tabl...

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  5. The first ionisation potential of Al is smaller than that of Mg becaus...

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  6. Which of the following gaseous atoms has the highest value of ionisati...

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  7. The first ionisation potential of Na,Mg,Al and Si are in the order

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  8. The first ionisation potential in electron volts of nitrogen and oxyge...

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  9. Which of the following relation is correct with respect first (I) and ...

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  10. The ionization energy will be higher when the electron is removed from...

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  11. Which of the following isoelectronic ion has the lowest 1st ionization...

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  12. A large difference between the third and fourth ionization energies in...

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  13. The second ionisation enthalpies of elements are always higher than th...

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  14. Which of the following is the correct order of ionisation energy?

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  15. The peaks in ionisation potential curves are occupied by

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  16. Which metal is the most reactive?

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  17. The five successive energies of an element are 800, 2427, 3658, 25024 ...

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  18. Which has maximum first ionization potential?

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  19. Values of IE(1),IE(2) and IE(3) of an element are 9.31, 18.21 and 553....

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  20. Which of the following is the correct order of ionisation energy? (1...

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